BSL(ID:1301/bsl001)Backtracking Specification Languagefor Backtracking Specification Language. A logic programming language fundamentally different from Prolog. A nondeterministic Algol-like language where variables cannot be assigned more than once except in controlled contexts. Each BSL program corresponds to an assertion in first order logic, and executing the program amounts to proving the assertion. Used to write an expert system CHORAL for harmonization of Bach-style chorales. References: |